Forging machine



June 2, 1964 B. KRALOWETZ 3,135,139

FORGING MACHINE Filed Dec. 30, 1959 2 Sheets-Sheet 1 H45 MEI/T J 1964 B.KRALOWETZ FORGING MACHINE 2 Sheets-Sheet 2 Filed Dec. 50, 1959 nv VEA/TmBR p KRIHJ) 14/572 7 GENT United States Patent 3,135,139 FORGING MACHINEBruno Kralowetz, Retzenwinklerstrasse 13, Steyr, Austria Filed Dec. 30,1959, Ser. No. 862,954 Claims priority, application Austria Jan. 8, 19591 Claim. (Cl. 78-21) This invention rel-ates to a forging machine inwhich the tool carriers consist of connecting rods which are spacedaround the periphery of the workpiece and are driven by eccentrics orthe like and which slide in radial guides of a suitably disc-shapedbearing body which is rotatable about the workpiece axis and particpatesin the swing movement of the connecting rods. In known machines of thistype, the disc-shaped bearing body has been freely rotatable and hasonly been driven by the connecting rods themselves to perform anoscillating swing movement about the workpiece axis. This guidance andmounting of the connecting rods has proved satisfactory because theconstruction is extremely simple. Nevertheless the known constructionrequires improvement. The mere drive of the bearing body by theconnecting rods results in relatively high wear at the guide faces inthe bearing body and at the connecting rods. The resulting increasedguide play adversely affects the working accuracy. A replacement of theworn connecting rods and of the bearing body is difficult because large,heavy and expensive parts of construction are concerned. The inventioneliminates this disadvantage.

The invention resides essentially in that the bearing body has anoscillating drive imparted thereto from the eccentric heads of theconnecting rods. The connecting rods have no longer the function ofdriving the bearing body during their swing movement but merely performa reciprocating movement in a guide which performs inherently the samemovement as the connecting rods so that there can be no canting and thewear of the guides in the bearing body and the connecting rods isminimized.

A particularly simple construction for the drive of the bearing bodiesfrom the eccentric heads is obtianed by rigidly afiixing forked driversto the bearing body, the prongs of which slide on opposite guide facesof the eccentric head which are parallel to the connecting rod. Thesedrivers may be removable to enable their replacement.

An illustrative embodiment of the invention is diagrammatically shown inthe accompanying drawing, in which FIG. 1 is a horizontal sectional viewshowing a forging box of a forging machine, taken on line I--I of FIG.2,

FIG. 2 is a vertical sectional view taken on line II-II of FIG. 1 andshowing a portion of the forging box; and

FIG. 3 is an exploded view of the two-part bearing body.

The driving eccentric shafts 1 are eccentrically mountice ed inrotatably adjustable bushings 3 in the forging box 2. A rotaryadjustment of the bushings 3 will displace the axes of the shafts 1 sothat the stroke position of the connecing rods 4 and with it the depthof penetration of the tools (not shown) which can be affixed to the freeend of the connecting rod, into the workpiece can be varied. Theworkpiece is fed in a vertical direction between the hammers formed bythe connecting rods 4 and the tools and may be rotated about its axis atthe same time.

To guide the connecting rods 4 a two-part, ring-shaped bearing body 5 ismounted in the forging box 2 for rotation about the workpiece axis. Thisbearing body 5 has radial guides 6 for slidably receiving the connectingrods. The bearing body 5 has forklike drivers 7 rigidly affixed thereto,the prongs 8 of which slide on opposite guide faces 9 of the eccentrichead 10, which guide faces are parallel to the connecting rod 4. Duringthe movement of the eccentric head only the movement thereof in theperipheral direction, with respect to the workpiece axis, will betransmitted by the drivers 7 to the bearing body 5 so that the same isdriven to perform an oscillating swing movement about the workpiece axisand the guides 6 assume always the correct position for the connectingrods because the guides are rigidly aflixed to the bearing body and,therefore, oscillate therewith and this oscillating motion is caused bythe same eccentric drive 1, 10 which oscillates the connecting rods.

What I claim is:

A forging machine for a workpiece which comprises connecting rodsadapted to carry tools, said connecting rods being spaced around theperiphery of the workpiece and extending in a radial direction withrespect to the workpiece axis, eccentrics, eccentric heads connectingsaid eccentrics to said connecting rods to impart to the latter anoscillating motion in peripheral and radial directions with respect tothe workpiece axis, a bearing body mounted for rotation about theworkpiece axis, radial guides mounted in said body and slidablyreceiving said connecting rods, and means for imparting to said bearingbody an oscillating angular motion in unison with said motion of saidconnecting rods in said peripheral direction while enabling a movementof said connecting rods relative to said bearing body in said radialdirection, said means comprsing forked drivers rigidly afiixed to saidbearing body and having prongs, said eccentric heads being formed withopposite guide faces extending parallel to the respective connecting rodand slidably engaged by said prongs.

References Cited in the file of this patent UNITED STATES PATENTS2,562,643 Saxer July 31, 1951 FOREIGN PATENTS 143,141 Australia Aug. 30,1951

